source: rtems/cpukit/libnetworking/libc/res_mkquery.c @ 029c374c

/*
 * Copyright (c) 1985, 1993
 *    The Regents of the University of California.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * Portions Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>

#include "res_config.h"

/*
 * Form all types of queries.
 * Returns the size of the result or -1.
 */
int
res_mkquery(
        int op,                 /* opcode of query */
        const char *dname,      /* domain name */
        int class, int type,    /* class and type of query */
        const u_char *data,     /* resource record data */
        int datalen,            /* length of data */
        const u_char *newrr_in, /* new rr for modify or append */
        u_char *buf,            /* buffer to put query */
        int buflen)             /* size of buffer */
{
        register HEADER *hp;
        register u_char *cp;
        register int n;
        u_char *dnptrs[20], **dpp, **lastdnptr;

        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
                h_errno = NETDB_INTERNAL;
                return (-1);
        }
#ifdef DEBUG
        if (_res.options & RES_DEBUG)
                printf(";; res_mkquery(%d, %s, %d, %d)\n",
                       op, dname, class, type);
#endif
        /*
         * Initialize header fields.
         */
        if ((buf == NULL) || (buflen < HFIXEDSZ))
                return (-1);
        memset(buf, 0, HFIXEDSZ);
        hp = (HEADER *) buf;
        hp->id = htons(++_res.id);
        hp->opcode = op;
        hp->rd = (_res.options & RES_RECURSE) != 0;
        hp->rcode = NOERROR;
        cp = buf + HFIXEDSZ;
        buflen -= HFIXEDSZ;
        dpp = dnptrs;
        *dpp++ = buf;
        *dpp++ = NULL;
        lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
        /*
         * perform opcode specific processing
         */
        switch (op) {
        case QUERY:     /*FALLTHROUGH*/
        case NS_NOTIFY_OP:
                if ((buflen -= QFIXEDSZ) < 0)
                        return (-1);
                if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
                        return (-1);
                cp += n;
                buflen -= n;
                __putshort(type, cp);
                cp += INT16SZ;
                __putshort(class, cp);
                cp += INT16SZ;
                hp->qdcount = htons(1);
                if (op == QUERY || data == NULL)
                        break;
                /*
                 * Make an additional record for completion domain.
                 */
                buflen -= RRFIXEDSZ;
                n = dn_comp((char *)data, cp, buflen, dnptrs, lastdnptr);
                if (n < 0)
                        return (-1);
                cp += n;
                buflen -= n;
                __putshort(T_NULL, cp);
                cp += INT16SZ;
                __putshort(class, cp);
                cp += INT16SZ;
                __putlong(0, cp);
                cp += INT32SZ;
                __putshort(0, cp);
                cp += INT16SZ;
                hp->arcount = htons(1);
                break;

        case IQUERY:
                /*
                 * Initialize answer section
                 */
                if (buflen < 1 + RRFIXEDSZ + datalen)
                        return (-1);
                *cp++ = '\0';   /* no domain name */
                __putshort(type, cp);
                cp += INT16SZ;
                __putshort(class, cp);
                cp += INT16SZ;
                __putlong(0, cp);
                cp += INT32SZ;
                __putshort(datalen, cp);
                cp += INT16SZ;
                if (datalen) {
                        memcpy(cp, data, datalen);
                        cp += datalen;
                }
                hp->ancount = htons(1);
                break;

        default:
                return (-1);
        }
        return (cp - buf);
}